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/*
 * Copyright 2020 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.security.oauth2.server.authorization.web;

import org.springframework.security.oauth2.core.AuthorizationGrantType;
import org.springframework.security.oauth2.core.endpoint.OAuth2ParameterNames;
import org.springframework.security.oauth2.core.endpoint.PkceParameterNames;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

/**
 * Utility methods for the OAuth 2.0 Protocol Endpoints.
 *
 * @author Joe Grandja
 * @since 0.0.1
 * @see OAuth2AuthorizationEndpointFilter
 * @see OAuth2TokenEndpointFilter
 */
final class OAuth2EndpointUtils {

	private OAuth2EndpointUtils() {
	}

	static MultiValueMap getParameters(HttpServletRequest request) {
		Map parameterMap = request.getParameterMap();
		MultiValueMap parameters = new LinkedMultiValueMap<>(parameterMap.size());
		parameterMap.forEach((key, values) -> {
			if (values.length > 0) {
				for (String value : values) {
					parameters.add(key, value);
				}
			}
		});
		return parameters;
	}

	static boolean matchesPkceTokenRequest(HttpServletRequest request) {
		return AuthorizationGrantType.AUTHORIZATION_CODE.getValue().equals(
				request.getParameter(OAuth2ParameterNames.GRANT_TYPE)) &&
				request.getParameter(OAuth2ParameterNames.CODE) != null &&
				request.getParameter(PkceParameterNames.CODE_VERIFIER) != null;
	}
}